The surface one from midiman. It's sort of like having 9 Kaoss pads, 16 knobs, and some buttons in a formation that makes it easy to play. Plus each of the strips transmits data for left/right, up/down, and pressure. So, you could potentially be controlling 27 aspects of a sound simultanously! Talk about expressive sound design capabilities. Would make an awsome live gigging tool too. I want one!